This is the second time this has happened. The car sits outside 24/7 in the midsouth area of 95* summers and 30* winters with lots of sunshine, no pollution and no acid rain that we know of in the Arkansas-Missouri mountain border area.

The car is one of those that the factory clear died and peeled.
The car was sanded well, aluminum hood stripped, deck lid sanded to bare metal, primed, sealed, base, and clear all PPG products. B/C was Omni.

In each case the navy blue paint lasted 3 years (almost exactly) and then began to pop. Gazillions of pops, all came up within a 3 week time frame the last couple months. The pops are 95% on the horizontal surfaces. The vertical sides are OK so far, but the C pillars are popped.

The pops look like tiny water droplets on the paint. Pops of .030 to .125 in diameter. Each is a dome of clear that has popped up and released from the blue base. Slight massaging makes the bubbles shed the clear leaving the blue base intact. A few have the B/C intact (.060) in the center of the pop and then the peel around it like a target.

Anybody have any idea what is causing this?

I have a personal hot rod to be painted soon and have always been a PPG loyalist. But???

first I'd look at your air supply (filters) that sounds exactly like water or oil in the lines.
then I would concider using a better paint Omini has a fairly decent clear but theirr base kinda (to put it nicely) sucks....
It could also be the application of the base (to thick to fast) Omini takes a lot of thin coats that dry very quick ,its very ez to spray the first coat to thick and trap the solvents..PPG has much better paints than Omini

I used to like that 161 clear it was a pretty good deal and I got a darn good job out of it,but I gave all those clears up once I tried SPI ...its comparable to glasuit and is priced like Nason ....100.00 a gal ....if you ever sand and buff it you'll never go back, its some of the best clear I've ever used ...at any price...

I dont believe in bad batches,I've never got a bad batch in all the years I've been painting...I'm not saying it dont happen ,just that its never happened to me...The hardener on the other hand will go bad and get thick after opening or sitting on the shelf to long...so putting a little of your mig welding gas in the can before closing it up will prolong its life conciderably...(the gas is heavier thar air )

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